Fir Iir Filter

i m doing a project on implementation of iirfilters using system generator based fpga. i m using spartan 3 starter kit for this purpose however i m facing problem as it is not providing me with any iirfilter response while on the same fpga firfilters are working properly, can sombody help (...)

95 kHz sampling rate sounds reasonable. What do you mean exactly with "but above 9KHz it is not stable"? Strictly spoken, firfilters are stable by nature. Did you verify the filter operation in Matlab with the numeric resolution used in the FPGA implementation?
If you are implementing a Chebyshev filter of moderate (...)

How long is the wiring between the sensor and the micro? If it's long (like 40cm or so) then you might want to use a shielded cable for that. And what is the time constant or cutoff frequency of that RC filter? It might be just bad component calculation. Other solution would be to implement an iir or firfilter inside MCU, (...)

Hi saatwik,
I'm not specialized in audio technology (I guess you are speaking about audio applications), but I can guess that if firfilter are not used, this is because the same result is obtained more simply with iir.
Of course, peak and notch filters can be made in fir. But:
a) if the (...)

...help me with further filtering process, either iir or fir...the sampling ratewas 500Hz.
is this rate ok?...
Hi
In ECG measurements, the most usual sampling rate is something 'even' multiple of standard main AC frequency in the country ( i.e.: n*2*60Hz / n*2*50Hz ). I worked with 240Hz. The reason to suc

Hello Experts,
The output of the firfilters is convolution of the input signal and the filter kernel. In that case, the length of the output signal should be greater than input signal by M-1 points where M is the length of the filter kernel.
x=ecg(500)'+0.25*randn(500,1); %noisy waveform (...)

the coefficients play a large role in the filter design. Any firfilter can be normalized (not including quantization issues). stable iirfilters can also be normalized (and excluding quantization issues).

Hi,
Can you please elaborate further on what kind of a filter you wish to implement? iir or fir? And what is the sampling frequency for your problem? Also is the higher frequency cutoff 40KHz or 40MHz?
Mohit

Clearly the answer depends on the type of impulse response. To represent an arbitrary impulse response, you would need a
respective number of fir coefficients. Some classes of responses may be reproducable with a rather short iir structure,
others not at all. Generally, the advantage of iir shows with representing time-continuous (...)